Function exhs

test/unit-tests/expression/node/OperatorNode.test.js:502–522

(example, parens = ['keep', 'auto'])

  // Variant of the `ex` tester that also tests implicit hide and show
  function exhs (example, parens = ['keep', 'auto']) {
    const imps = ['hide', 'show']
    const hasi = 'i' in example
    const expr = hasi ? math.parse(example.i) : example.n
    const orig = hasi
      ? example.i
      : `${expr.getIdentifier()}${expr.args.map(arg => arg.getIdentifier())}`
    for (const paren of parens) {
      const skey = 's' in example ? 's' : 's' + paren
      const lkey = 'l' in example ? 'l' : 'l' + paren
      for (const i of [0, 1]) {
        const prefix = `${orig},${paren},${imps[i]}: ` // eases reading of failure output
        assert.strictEqual(
          prefix + expr.toString({ parenthesis: paren, implicit: imps[i] }),
          prefix + example[skey][i])
        assert.strictEqual(
          prefix + expr.toTex({ parenthesis: paren, implicit: imps[i] }),
          prefix + example[lkey][i])
      }
    }
  }

  it('should format implicit multiplications', function () {
    exhs({ i: '4a', s: ['4 a', '4 * a'], l: ['4~ a', '4\\cdot a'] })